Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1161581AbWHDXik (ORCPT ); Fri, 4 Aug 2006 19:38:40 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1161582AbWHDXik (ORCPT ); Fri, 4 Aug 2006 19:38:40 -0400 Received: from mx1.redhat.com ([66.187.233.31]:63392 "EHLO mx1.redhat.com") by vger.kernel.org with ESMTP id S1161581AbWHDXik (ORCPT ); Fri, 4 Aug 2006 19:38:40 -0400 Date: Fri, 4 Aug 2006 19:38:15 -0400 From: Dave Jones To: "Eric W. Biederman" Cc: vgoyal@in.ibm.com, fastboot@osdl.org, linux-kernel@vger.kernel.org, Horms , Jan Kratochvil , "H. Peter Anvin" , Magnus Damm , Linda Wang Subject: Re: [RFC] ELF Relocatable x86 and x86_64 bzImages Message-ID: <20060804233815.GG18792@redhat.com> Mail-Followup-To: Dave Jones , "Eric W. Biederman" , vgoyal@in.ibm.com, fastboot@osdl.org, linux-kernel@vger.kernel.org, Horms , Jan Kratochvil , "H. Peter Anvin" , Magnus Damm , Linda Wang References: <20060804225611.GG19244@in.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.4.2.2i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1129 Lines: 29 On Fri, Aug 04, 2006 at 05:14:37PM -0600, Eric W. Biederman wrote: > I guess the practical question is do people see a real performance benefit > when loading the kernel at 4MB? Linus claimed lmbench saw some huge wins. Others showed that for eg, a kernel compile took the same amount of time, so take from that what you will.. > Possibly the right solution is to do like I did on x86_64 and simply remove > CONFIG_PHYSICAL_START, and always place the kernel at 4MB, or something like > that. > > The practical question is what to do to keep the complexity from spinning > out of control. Removing CONFIG_PHYSICAL_START would seriously help with > that. Given the two primary uses of that option right now are a) the aforementioned perf win and b) building kexec kernels, I doubt anyone would miss it once we go relocatable ;-) Dave -- http://www.codemonkey.org.uk - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/